221 2318 222

I f lm495.171 - 9’ 2Y”O~B”l5m39s571+72037‘ 42”3 + 148.121 -11 5 . 6 6 15 38.221 72 36 5.7

Observations of Comet b 1880 (Schaberle), made at Dun Eelit Observatory with the Filar-Micrometer on the 15 in. Refractor.

J. G. L. ?,

Date 1880

+ 3 55.53 - 0 6.81 + 0 11.80 + 7 27.54 - 3 45.25 + 1 45.55 + 0 3 . i6 - 0 15.75

a b c

- 2 19.216 15 38.461 72 36 4.6! ,, - 7 16.316 15 17.541 71 58 15.0; R. C. -- 3 34.46 14 47.18/ + 2 29.96 14 44.651 67 58 58.0 ), + 3 34.76 15 2.641 66 45 45.1 R, C. + 3 53.916 15 47.43 64 59 13.5, ?,

- 1 26.86 17 9.16 62 45 35 8‘ ,, - 7 39 .46 19 21.82 60 5 38.51 J . Q. L.

70 32 29.2’ J. G. L.

i k 1

- 1 8.421 - 2 13.216 19 22.25-+60 1 I

Dun Echt &I. T.

5 5.3i ,, 1

1 lh57m45f 12 55 41 12 55 41 10 58 23 13 51 16 13 8 58 12 36 6 12 19 43 11 6 49 12 23 10 12 48 51

Red. +2s31

2.27 2.27

2.12 1.84 1 90 1 75 1.68

1 . G 1 1.62 1.73

d Red. +72”46‘ 56 ‘6 + 14’7

72 38 9.1 14.7 72 5 16.8 14.6

70 35 49.8 13.8 67 56 15.4 12.7 66 41 55.4 12.0 64 55 8 . 4 11.2 62 46 52.6 10.0

60 13 9 . 3 8 .6 60 7 9 .9 8.6 64 .57 48.7 11.2

Adopted Nean Places of Comparison-stars for 18tO.

R e m a r k s : April 22. With power 442 no nucleus visible; tail

well seen with powers 269 and 442; it is a little broa- der than the head. Approx. pos. of tail .58°44’. Bright moonlight.

April 25. Comet faint; nucleus recognizable ; tail broad. Observations somewhat difficult in consequence of moonlight and light clouds.

Nay 1. The comet had a very small almost stellar nucleus = 1 3 m 5 star, and a tail about 4‘ long in pos. 4807. Power 229.

Jlay 4. Tail about 7’ long, p -= 5102 (3 meas.). A very small stellar nucleus seen with power 329. -

Arg.-Oe. 6740. 6695.

3 Bann. Cat. + 720317 + A.-Oe. 6767 4

Radcliffe Cat. Xo. li07. Bonn. Cat. 4- 6 i W 2 . Arg.- Oe. 6834. D . A1 . -+ 64ObH2 ; place determined from ,,C.L‘ Arg.-Oe. 681j -+ 6816

- __ -- -

_ _ _ _ _ .__

2 - 6871. - 6892.

Bonn. Cat. 7 64°.5d0.

The A. R. o f + 640339 in the the star has a strong red tinge.

31. is

Xay 3. Tail about 6’ long,

0s two small

-

Nay 13. The comet has a small sharp nucleus = 1% star; in the finder it is an exceedingly faint object.

From a Paris observation for April 8 given in the Oomptes Rendus, Tome X C , p. 91 1

Paris hi. T. R.A. N. P. D. 1880 April 8. 12’14m55s 6h54m23894 6050’ 24”s

,,already corrected for the effect of parallax“, and from the Dun Echt dcterminations of April 23 and May H we have deduced the following elements by Prof. Klin- kerfues’ method for the Equator:

223 2318 224

19

22, 26 30 1

T = 18S0 J u l y 1.569186 n - S& $- A = 347035' 58"9 z - - a + B = 41 4 2.61

6h22m19sO 6 23 55.2 6 26 i . 2 6 28 22.2 6 45 49.2

n - a + C = 119 38 28.4( Mean Equinox 1880.0 logn = 9.i60554

J log b = 9.964718 loge = 9.936311 logq = 0.258990

The residuals for the middle observation are:

1880 ; (i

May

J ul 1-

Bug.

Sept.

Oct.

R O Y .

d

t 5i"ll' 58' 55 49 54 54 5 38 52 26 46 41 34 58 37 3 11 32 41 50 29 28 i 28 13 16 2'; 2 44 25 50 G 24 35 2 23 l i 4 21 55 46 20 30 38 19 1 8 17 26 43 10 9 5

-- 1 2 31 - 9 4 1 1 - 17 37 6

drc d = - 4"9 d d == - 2 . 0

The angular elements for the Ecliptic a re :

62 - 257 14 31 .8 i = 123" 4' 8' 0

n = 42 IS 19.8 Neal1 Equinox 183Q.o 1

The subjoined ephemeris fur Berlin Midnight i s sufficiently detailed to give a geiieral idea cif the comet's path duriug the next six months.

log r 0.271913 0.275470 0.2i2461 0.269727 0.258990 0,261696 0.2G9G% 0.278633 0.282154 0.285903 0.289868 0.294033 0.298386 0 506910 0.3055139 0.3 I 24 1 r3 0 . 3 17358 0.3331'iu 0.36005<5 0 382418 0.40481 i

log A

0.38iT01 0.393537 0.400885 0 407701 0.439414 0.434599 0.426061 0.4037% 0.401549 0.393558 0.384841 0.375400 0.3365260 0 354449 0.343016 0.333024 0 .3 18551 0,2666i8 0,220191 0.203124 0.228383

3~ightness 0.52 0.50 0.70 0 . 7 7 0.70 (1. 70 0 . 70

0 . 75 0.57 0 .78 0 . bU 0.52 0.85 0. PS 0 . b P 0 . :a4 1. ( 1 %

I . 21 1.15 0.95

o .74

I n this latitude the midnight twilight has now become so stro:ig a3 tc, ohliterate every trace of the comet Lord Lindsay's Observatory, Dun Echt l h b 0 May 28.

Ka@ Copelait (1, J , G e d . L oli ,5 e ,

Berichtigungen zu Crelle's Rechentafeln. I n addition to the typographic error in C r e 11 e' s R e c h e n t a f e 1 n published in the A s t r o-

n o m i s c h e N a c h r i c h t e n , Bd. 92, 143, I remark two others which appear in the editions of 1557 and 18i5, and also probably in the intermediate editions of 1864 and 1869:

I n the product of 112 by 43i.

I n the product of 265 by 881, for 499 read 489.

for 2234 read 2334. D. P, Todd.

--.-____I .___ Nautical Almanac Office, Washington, 12. March, 1880. ________~_ __ - - --____-___

I<iel. Juni 10. 1880. Drucl. von C. F. Morrn.